Find number of champ numbers between range x and y

1

Given range x and y you have to find number of champ numbers between these range

Champ numbers are:
numbers in which every digit is distinct
All digits are less than 5

Can anyone solve this question ???
X and y are large 10^9

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2
Hint

Realise that there is an upper bound on the largest possible champ number, and that it is pretty small. The largest possible champ number is 43210.

3

Thanks brother done!!

Actually I could not think before that champ numbers in range (1-10^9) is only 1650 in total so I should better generate them instead of checking all

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